Content addressable memory (CAM) devices having dedicated mask cell sub-arrays therein and methods of operating same
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United States of America Patent
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Jan 4, 2005
Issued Date -
N/A
app pub date -
Mar 11, 2003
filing date -
Mar 15, 2002
priority date (Note) -
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Abstract
Content addressable memory (CAM) devices achieve high integration by utilizing one or more CAM arrays that are each partitioned by rows into a CAM cell sub-array and a dedicated mask cell sub-array. Each row of mask cells within the mask cell sub-array can be selectively read during one search operation and then used to globally mask one or more columns of the CAM cell sub-array during a following search operation. Mask assertion circuitry is provided to couple a respective mask cell sub-array to a bit/data line control circuit that drives bit and/or data lines to the CAM cell sub-array during read, write and search operations. The mask cell sub-array and CAM cell sub-array may be segmented arrays that support pipelined search, write and read mask operations.
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